Three-way pull-chain socket.



"1. r. MCCARIHY.

THREE-WAY PULL CHAIN SOCKET.

APPLICATION FILED 050.29. |916.

Patented Aug. 28, 1917.

WITNESSES f A TTUH/IEYS A`attarnrin the' county at one 55 comparatively UNITED sumas-.PATENT OFFICE.

"THREE-WAY PULL-cnam SOCKET. i l

-To all whom t may concern.'

. Be it known that-I,v JOHN F.` MCCARTHY, a citizen of the United States, and a resident of thecityv of New York, borough of Man- V and State of New Y` rl.f\, v have ,invented a new and Improved Three-Way Pull-Chain Socket, of whlch the -followingis a full, clear, and exact description.

.This inventionrelates to an electrical socket Aand particularly to a socket to be used "in connectionl with av switch or another socket of a similar nature whereby the light connected with the socket maybe turned on place and turned off at another. The object in viewis to provide an improved socket for electric lamps which will dispense with one switchfwhen it is desired l to turn the light 0H and on at two different '-places.

Another .obj ect in viewuis to switch whichk hasthree ways whereby the same may vcoact-withzan ordinary three-way switch.

In the accompanying. drawing Figure .-1 is. a longitudinal vertical section through a three-waypull vchain socket disclosing an embodiment of the invention. Fig. 2 is a'fragment'aryfsectional view through Fig. 1 on line 2-l2.

Fig. 3 is a view similar to Fig. 2 but with the switch arms in aydifferent position. Fig 4 is a plan view through a switch of ordinary construction, the casing being removed.

Fig. 5 is a diagram showing'the wiring.

and arrangement of the 'switches disclosed in Figs. 1 and 4 associated therewith.

Referring tothe accompanying drawing 40 by numerals, 1 indicates a casing of any desired kind provided with van insulating jacket 2 of theusual construction for the l ordinary two-way pull chain socket now in common use. Asshown in Figs. 1, 2 and 3, the construction is the same as an ordinary two-way pull chain socket except for the certain additions `and changes necessary to produce a three-way pull chain socket with the characteristics shown in the drawing. In forming the mechanism of-a pull socket a pivotally mounted switch member 3 is providedwhich is formed with arms 5 and 6 desi ed to engage the; contacts ,7, 8 and` 9 atdliierent times, contacts 7 and 8 bein i small 'whilecontact 9 is su Feiently large to allow oneof the arms 5 Specification of Letters Patent -1n Figs. 2 and 3.

provide a pull tact 17 by Patented Aug. `28, 1917.

Application ledIJecember 29, 1916. Serial No. 139,500. I i

and 6 to rest thereon while resting oneither f the contacts 7 or 8,*as clearly illustrated This construction is different from the ordinary two-way pull socket in that the Contact 9 is longer than the others and arranged to contactv as just described. Also, in arranging the present invention or attaching the same to an ordinary two-way pull chain socket, the current 1s brought in throughfwi'res 10 to a contact plate 11, which contact plate has the lower part held in position by the screw 12, which lscrew engages the center of the lamp in the usual manner so as to transmit current to the lamp, andfrom the lamp the current will pass to the sleeve 18 and from said sleeve to contact 9.

As shown in Fig. 5, a source of current 14 is connected to the binding post 15 lon a switch 16 and kto the ContactJ plate 11 through wire 10. The switch 16 is the ordinary switch now need-no detail description, except that 'the wire 14 leads to. the binding post 15 and said binding post is connected to the cona suitable wire` so that current is always supplied to the contacts or binding posts 15 and 17 and is switched alternately on to the contacts'18 and 19 according to the position of thearm 20. Contact 18 is connected by wire 21 to the contact 8, while` contact 19 is connected through wire 22 to the contact 7. It will also be noted that the lamp is connected at its center to the Contact .plate 11 by engaging the screw 12 and the shell ofthe lamp is connected to the contact 9 while engaging the sleeve 13 which is connected by a suitable wire to the Contact 9.

When the parts are in the position shown in Fig. 5 currentv will passfrom the wires 14 to the contacts 15 and 17 through the switch arm 20, contact 19 and wire 22, contact to arms 5 and 6 of switch member 3, contact 9, and from thence and from the lamp out through wire 10 back tothe source of current. If the switch member 3. is turned to the position shown in Fig. 2 current will pass :from` the source 14 to contact 15 and from thence through the switch arm 20, contact 18, wire 21, contact 8, switch member 3 and `associated parts, and from thence through the lam and back to the source. -When it is desire to shut olf the light when the arts are arranged as shown in Fig. 5, zeit er the kpull through the lamp.

1n common use and will v stairs in a ways remain in contact with one of ains while the other arm is in contact with socket member is operated or the switch 16. If the switch 16 is operated the lamp will be deprived of current and may be again su lied by operating either switch.

his arrangement will dispense with one switch now in ordinary use where a lamp is lighted and turned out yfrom two different places, as for instance, down stairs and up dwelling. By using the threewa pull chain socket described and a swltch as shown in Fig. 4, the same result may were used in the wall.

What I claim is:

1. A three-way pull chain socket comprising three spaced contacts, one of which is longer than the others, a rotatable contact member having arms and designed to engage said contacts, said arms being of suilicient length that the long contact willlal sai one of the other contacts, means for connecting supply wires to the two short con'- tacts, yand a contact plate connected with the source of supply extending to` a position to be `engaged by the lamp when placed in position in the socket.

2. In a switch of the character described, a casing, a pair of spaced contacts arranged in said casing, means for connecting lead wires to said contacts, a contact plate arranged independent of said contacts, means for connecting a supply wire to said contact be accomplished as if two switchesy plate, a third contact having a comparatively long contact surface, means for connecting a lam with said last mentioned contact and said contact plate, and a rotatable switch member formed with a pair of arms of substantially the same length, the length .of the last mentioned contact being such as to' always engage one of said arms when the opposite arm is contacting with one of the other contacts.

3. In a threea pull chain socket of the character describedr, a pair of contacts connected to lead-in wires, a third contact of an appreciable length designed to be connected with one side of an electric lamp, a contact bar connected to a lead-in wire designed to be connected to the opposite side of the lamp, and a switch member having a pair of contact arms, said arms being of such length as to engage one of said pair of contacts while the other is engaging the other contact.

4. In a socket of the character described, a pair of contacts arran edto be connected to lead-in wires, a thir contact of an appreciable length, a switch member having contact arms arranged to contact with said pair of contacts at different times and said third contact, means for intermittently moving said switch member, a contact plate arranged to be connected Vto a supply wire,

and means for connecting a lamp to said contact plate and said third contact.

JOHN F. MGCARTHY. 

